Nothing close enough? Start from a blank function block diagram → Describe it in one paragraph.
How to use a function block diagram template.
- 01List the function blocks needed
Name each block (PID, TON, ADD, SCALE) and its parameters — the AI places them as typed blocks.
- 02Connect the data flows
Describe which output pin of one block feeds which input pin of the next — the AI draws the typed connections left to right.
- 03Add inputs and outputs
Name the program inputs (process values, setpoints) and outputs (control outputs) that enter and leave the network.
- 04Export for PLC documentation
Export as PNG/SVG for code review or as reference documentation in a control system design package.
Questions about function block diagram templates
What is a Function Block Diagram?
One of five IEC 61131-3 PLC programming languages. FBD represents a program as a network of function blocks connected by data-flow lines — similar to a schematic where data flows left to right.
When should I use FBD instead of Ladder?
FBD is better for continuous process control (PID loops, signal processing, analog calculations) where data flows between blocks. Ladder is better for discrete I/O logic (motor starters, interlocks, sequencers).
What is the difference between an FBD and a block diagram?
A generic block diagram is documentation. An IEC 61131-3 FBD is executable PLC code — blocks are typed standard function blocks (ADD, PID, TON) with defined behavior, not just labeled boxes.